//语法
const a = (params = 2) => 1 + params;
const b = [1, 2, 3];
const c = [...b, 4, 5];
class Babel {}
new Babel();
//API
const x = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10].filter((x) => x % 2 === 0);
const y = Object.assign({}, { name: 1 });
